Unfortunately, I believe it's very optimistic to think that. From what I have collated, and I've been following the war fairly closely, the Russian strategic nuclear defence is very highly funded and held to a high standard, as it is basically their fall-back that allows them to push their weight around without repercussions.
I also think that Ukraine's early success may not be something that persists - the early days of the war did have severe blunders by the RUAF - for example the Rosgvardia were deployed because they expected the Ukrainians to roll over, they aren't a proper military unit they are more of a police force, hence they got slaughtered.
Now it seems to be a war of attrition. As Stalin said, quantity is a quality of it's own, and if Ukraine can't come up with some dramatic progress soon it may come down to numbers.
Maybe Russia shouldn't have started a war of aggression against it's neighbour then. Newsflash, war isn't nice, people start doing sick things. Personally I can't fault the Ukrainians for using any advantage they can get, however morally corrupt it may seem.